Portable power supply



FIG. 1 is a side perspective view of a portable power supply of my newdesign;

FIG. 2 is a rear, side perspective view thereof; and,

FIG. 3 is a top, side perspective view thereof.

The broken lines in the drawings are for the purpose of illustratingportions of the portable power supply that form no part of the claimeddesign.

CLAIM The ornamental design for a portable power supply, as shown anddescribed.